MEMPHIS, Tenn. — For many years, Rose Sims had no idea what was going on inside a nondescript brick building on Florida Street a couple of miles from her modest one-story home on the southwestern side of town.

Like other residents, she got an unwelcome surprise in October 2022 at a public forum held by the Environmental Protection Agency at the historic Monumental Baptist Church, known for its role in the civil rights movement. The EPA notified the predominantly Black community that Sterilization Services of Tennessee —which began operations in the brick building in the 1970s — had been emitting unacceptably high levels of ethylene oxide, a toxic gas commonly used to disinfect medical devices.

Airborne emissions of the colorless gas can increase the risk of certain medical conditions, including breast cancer. Sims, who is 59 and Black, said she developed breast cancer in 2019, despite having no family history of it, and she suspects ethylene oxide was a contributing factor.

“I used to be outside a lot. I was in good health. All of a sudden, I got breast cancer,” she said.

Local advocates say the emissions are part of a pattern of environmental racism. The term is often applied when areas populated primarily by racial and ethnic minorities and members of low-socioeconomic backgrounds, like southwest Memphis, are burdened with a disproportionate amount of health hazards.

The drivers of environmental racism include the promise of tax breaks for industry to locate a facility in a heavily minority community, said Malini Ranganathan, an urban geographer at American University in Washington, D.C. The cheaper cost of land also is a factor, as is the concept of NIMBY — or “not in my backyard” — in which power brokers steer possible polluters to poorer areas of cities.

A manager at Sterilization Services’ corporate office in Richmond, Virginia, declined to answer questions from KFF Health News. An attorney with Leitner, Williams, Dooley & Napolitan, a law firm that represents the company, also declined to comment. Sterilization Services, in a legal filing asking for an ethylene oxide-related lawsuit to be dismissed, said the use of the gas, which sterilizes about half the medical devices in the U.S., is highly regulated to ensure public safety.

Besides southwest Memphis, there are nearly two dozen locales, mostly small cities — from Athens, Texas, to Groveland, Florida, and Ardmore, Oklahoma — where the EPA said in 2022 that plants sterilizing medical devices emit the gas at unusually high levels, potentially increasing a person’s risk of developing cancer.

The pollution issue is so bad in southwest Memphis that even though Sterilization Services planned to close shop by April 30, local community leaders have been hesitant to celebrate. In a letter last year to a local Congress member, the company said it has always complied with federal, state, and local regulations. The reason for its closure, it said, was a problem with renewing the building lease.

But many residents see it as just one small win in a bigger battle over environmental safety in the neighborhood.

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